A headless fastener externally threaded on both ends with each threaded portion of one but not necessarily the same nominal diameter. It is designed to be locked in place by either a ring, lock, serrated or a ring, lock, keyed.
NSN 5895-00-226-6522
NSN 5925-01-350-3646
NSN 5905-01-376-4449
NSN 6685-00-072-8647
NSN 5950-01-080-4821
NSN 6135-01-572-3296
NSN 5915-01-422-5494
NSN 6320-00-456-0836
NSN 5920-01-292-0686
NSN 5950-00-456-0665
NSN 5990-00-814-3626
NSN 5915-01-092-5575